Bones,
I don't think you have to concern yourself with a massive, rapid, appreciation in the values of Aero 8s after the production stops.
As a rule, the Aero 8s depreciation has been better than other £60-£70k cars over a period of 3-years; however, they do loose money and figures of £5-£10k within the first 12-months would not be unrealistic. What the car does do well is that the depreciation slows drastically in the 3rd year of new ownership and therefore, the Series 1 cars are still circa £35k (for a nice one), S2 are £40K+ and S3/S4 are in the £50ks (this is a general rule of thumb and some will be sold for more and some for less).
My belief is that the end of production will create a situation where the initial depreciation is slowed down (not stopped but slowed down) and that second hand values will harden. In time, I can imagine prices for good example used models increasing but this will take a few more years in my humble opinion and depend greatly on what the spiritual successor to the Aero 8 is.
I hope that helps but if you have any other questions, just ask.
